DE3828081A1 - SEALING DEVICE FOR ROTATING COMPONENTS IN ROLLING BEARINGS - Google Patents
SEALING DEVICE FOR ROTATING COMPONENTS IN ROLLING BEARINGSInfo
- Publication number
- DE3828081A1 DE3828081A1 DE3828081A DE3828081A DE3828081A1 DE 3828081 A1 DE3828081 A1 DE 3828081A1 DE 3828081 A DE3828081 A DE 3828081A DE 3828081 A DE3828081 A DE 3828081A DE 3828081 A1 DE3828081 A1 DE 3828081A1
- Authority
- DE
- Germany
- Prior art keywords
- disc
- seal according
- support
- disk
- shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/762—Sealings of ball or roller bearings by means of a fluid
- F16C33/763—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap
- F16C33/765—Sealings of ball or roller bearings by means of a fluid retained in the sealing gap by a magnetic field
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/80—Labyrinth sealings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/002—Sealings comprising at least two sealings in succession
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
- G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2370/00—Apparatus relating to physics, e.g. instruments
- F16C2370/12—Hard disk drives or the like
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Sealing Of Bearings (AREA)
Description
Die Erfindung betrifft eine magnetische Flüssigkeitsdichtung gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a magnetic liquid seal according to the preamble of claim 1.
Eine solche Dichtung ist beispielsweise in der DE-GM 87 02 472 beschrieben. Sie bestehen in der Regel aus einer oder zwei ebenen Scheiben und einem dazwischenliegenden axial magneti sierten Permanentmagneten. Die Scheibe bzw. Scheiben bestehen aus magnetisch leitendem Material und bilden je einen Polschuh für je einen Luftspalt. Mindestens einer dieser Luftspalte ist mit einer magnetisch leitenden Flüssigkeit (Ferrofluid) befüllt und dichtet damit zwei Räume gegeneinander ab. Die relativ kleinen Luftspaltflächen weisen ein schwaches magnetisches Arbeitsfeld auf. Zudem führen nicht mehr funktionsfähige Dich tungen (ausgelaufen oder durch Alterung undicht) dazu, daß Partikel vom Motorlagerraum nach außen, d. h. von einem Raum in einen anderen gelangen können, was z. B. den Ausfall bei Hartplattenspeicherlaufwerken bedeuten würde.Such a seal is for example in DE-GM 87 02 472 described. They usually consist of one or two flat disks and an intermediate axial magneti based permanent magnets. The disc or discs are made made of magnetically conductive material and each form a pole piece for one air gap each. At least one of these air gaps is filled with a magnetically conductive liquid (ferrofluid) and seals two rooms against each other. The relative small air gap areas have a weak magnetic Working area. In addition, you no longer function properly tations (leaked or leaking due to aging) that Particles from the engine storage area to the outside, d. H. from a room can get into another, what z. B. the failure Hard disk storage drives would mean.
Aufgabe der Erfindung ist es, die Sicherheit der in Rede stehen den Dichtung zu verbessern und die Funktion der Dichtung auch bei ausgelaufener Dichtflüssigkeit aufrechtzuerhalten.The object of the invention is to ensure the security of the issue to improve the seal and the function of the seal as well if the sealant has leaked.
Die Lösung der Aufgsbe ist im kennzeichnenden Teil des Anspruchs 1 angegeben.The solution of the problems is in the characteristic part of the Claim 1 specified.
Eine erfindungsgemäße Stützscheibe fixiert und stützt einer seits das Kugellager auf der Welle des Antriebsmotors in axialer Richtung und sorgt andererseits mit seinem scheibenförmigen Abschnitt für einen besseren magnetischen Fluß, wodurch eine Verkleinerung des Permanentmagneten in der Dichtung ermöglicht wird.A support disk according to the invention fixes and supports one hand the ball bearing on the shaft of the drive motor in axial Direction and on the other hand ensures with its disc-shaped Section for better magnetic flux, creating a The permanent magnet in the seal can be reduced in size becomes.
Weitere Einzelheiten und vorteilhafte Weiterbildungen der Er findung ergeben sich aus dem im folgenden beschriebenen und in der Zeichnung dargestellten Ausführungsbeispiel, sowie aus den Unteransprüchen. Es zeigen:Further details and advantageous developments of the Er invention result from the following and in the drawing shown embodiment, and from the dependent claims. Show it:
Fig. 1 einen Halbschnitt durch eine erfindungsgemäße Dichtung und Fig. 1 shows a half section through a seal according to the invention and
Fig. 2 einen vergrößerten Teilschnitt der Dichtung gemäß Fig. 1. FIG. 2 shows an enlarged partial section of the seal according to FIG. 1.
Fig. 1 und Fig. 2 zeigen nur wesentliche Teile eines Laufwerks, das beispielsweise in Speicherplattenantrieben eingesetzt wird. Eine Welle 11 eines nicht dargestellten Antriebsmotors läuft in Kugellagern 12, 13. An einem Ende der Welle 11 ist eine Nabe 14 drehfest angebracht, die zur zentrischen Befestigung von Speicherplatten dient. Die Kugellager 12, 13 sind in einer Bohrung eines Motorflansches 15 eingebaut. Zur Sicherung gegen axiale Verschiebung des auf der Welle 11 befestigten Innenringes 16 des Kugellagers 12 ist eine magnetisch leitende Stützscheibe 17 auf die Welle 11 gepreßt, die in axialer Richtung mit vorge gebener Kraft gegen den Innenring 16 anliegt. Die Stützscheibe 17 weist zwei Bereiche (in radialer Richtung gesehen) auf, einen inneren Bereich, der die Form einer Buchse 18 hat, und einen äußeren Bereich, der als scheibenförmiger Abschnitt 19 ausgebildet ist, wie es insbesondere in Fig. 2 zu erkennen ist. Vorzugsweise ist die Stützscheibe einteilig ausgebildet. Der scheibenförmige Abschnitt 19 weist zwei im wesentlichen plan parallele Flächen 31, 32 auf, die senkrecht zur Welle 11 ver laufen (Fig. 2). Die obere Fläche 31 liegt einer Stirnseite eines Permanentmagneten 21 gegenüber, während die untere Fläche 32 der oberen Stirnseite des Kugellagers 12 gegenüber angeord net ist. Fig. 1 and Fig. 2 show only essential parts of a drive that is used for example in disk drives. A shaft 11 of a drive motor, not shown, runs in ball bearings 12 , 13 . At one end of the shaft 11 , a hub 14 is rotatably attached, which is used for the central fastening of storage disks. The ball bearings 12 , 13 are installed in a bore in a motor flange 15 . To secure against axial displacement of the inner ring 16 of the ball bearing 12 fastened on the shaft 11 , a magnetically conductive support disk 17 is pressed onto the shaft 11 , which bears in the axial direction with a given force against the inner ring 16 . The support disk 17 has two areas (seen in the radial direction), an inner area which has the shape of a bushing 18 , and an outer area which is designed as a disk-shaped section 19 , as can be seen in particular in FIG. 2. The support disk is preferably formed in one piece. The disk-shaped section 19 has two substantially plane parallel surfaces 31 , 32 which run perpendicular to the shaft 11 ( FIG. 2). The upper surface 31 is opposite an end face of a permanent magnet 21 , while the lower surface 32 of the upper end face of the ball bearing 12 is opposite angeord net.
Das Kugellager 12 dient hier nicht zum Schließen des magneti schen Kreises. Dadurch zieht es auch keine Partikel an, die die Laufbahn der Kugeln zerstören können. Kugellagerstahl hat auch keine guten magnetischen Eigenschaften.The ball bearing 12 is not used to close the magnetic circuit. As a result, it does not attract particles that can destroy the balls' track. Ball bearing steel also does not have good magnetic properties.
In kleinem Abstand ist in axialer Richtung oberhalb der Stütz scheibe 17 der scheibenförmige Permanentmagnet 21 angeordnet, der an seiner Außendurchmesserfläche in der Bohrung des Motor flansches 15 befestigt ist, während der buchsenartige Bereich 18 der Stützscheibe 17 mit vorgegebenem Spiel in die Innen bohrung 22 hineinragt. Die Buchse 18 ragt in axialer Richtung über den scheibenförmigen Abschnitt 19 hinaus.At a short distance in the axial direction above the support disc 17, the disc-shaped permanent magnet 21 is arranged, which is attached to its outer diameter surface in the bore of the motor flange 15 , while the bush-like region 18 of the support disc 17 projects into the inner bore 22 with a predetermined play. The bushing 18 projects beyond the disk-shaped section 19 in the axial direction.
Durch den beschriebenen Aufbau wird um die Außenkontur der Stützscheibe 17 herum ein labyrinthartiger Spalt 25 gebildet, der im wesentlichen U-förmig ist.Due to the construction described, a labyrinth-like gap 25 is formed around the outer contour of the support disk 17 , which is essentially U-shaped.
Oberhalb des Permanentmagneten 21 ist eine Polscheibe 26 be festigt, deren Außenfläche in gleicher Weise wie der Permanent magnet 21 konzentrisch zur Welle 11 in der Bohrung des Motor flansches 15 befestigt ist. Die Polscheibe weist eine Innen bohrung auf, deren Durchmesser größer ist als der der Welle 11, und bildet somit einen Spalt 27, der mit einer magnetischen Dichtflüssigkeit (Ferrofluid) befüllt ist. Als weitere Schutz maßnahme gegen das Austreten von Ferrofluid ist oberhalb der Polscheibe 26 eine Abdeckkappe 28 angebracht.Above the permanent magnet 21 , a pole disk 26 is fastened, the outer surface of which is fixed in the same way as the permanent magnet 21 concentrically to the shaft 11 in the bore of the motor flange 15 . The pole disk has an inner bore, the diameter of which is larger than that of the shaft 11 , and thus forms a gap 27 which is filled with a magnetic sealing liquid (ferrofluid). As a further protective measure against the escape of ferrofluid, a cover cap 28 is attached above the pole disk 26 .
Der Durchmesser der Innenbohrung 22 des Permanentmagneten 21 kann vergrößert werden, um noch einen ausreichenden Magnetfluß im Spalt 33 zwischen der oberen Fläche 31 des scheibenförmigen Abschnittes 19 der Stützscheibe 17 und dem Permanentmagneten 21 zu gewähr leisten. Dadurch wird relativ teures Magnetmaterial gespart. Andererseits kann aber auch der Außendurchmesser des Permanent magneten 21 verringert werden, wodurch der Durchmesser der Dichtung und der Lagerung des Motors kleiner wird, d. h. der Motor kann im Außendurchmesser kleiner werden.The diameter of the inner bore 22 of the permanent magnet 21 can be increased in order to ensure a sufficient magnetic flux in the gap 33 between the upper surface 31 of the disk-shaped section 19 of the support disk 17 and the permanent magnet 21 . This saves relatively expensive magnetic material. On the other hand, the outer diameter of the permanent magnet 21 can also be reduced, as a result of which the diameter of the seal and the mounting of the motor become smaller, ie the motor can become smaller in the outer diameter.
Die als scheibenförmige Buchse ausgestaltete Stützscheibe 17 schließlich schützt das Lager 12 zusätzlich vor schädlichen Partikeln oder vor etwa abspritzendem Ferrofluid. Durch die labyrinthförmige Anordnung des rotierenden Teiles 17 zwischen der Ferrofluid-Dichtung (21, 26, 27) und dem Kugellager 12 ist selbst bei nicht mehr funktionierender Ferrofluid-Dichtung ein Schutz des Reinraumes (beispielsweise in Plattenspeicher laufwerken) gegen aus dem Motorlager 12 kommende Partikel gegeben.Finally, the support disk 17 , which is designed as a disk-shaped bush, additionally protects the bearing 12 from harmful particles or from ferrofluid that may spray off. Due to the labyrinth-shaped arrangement of the rotating member 17 between the ferrofluid seal (21, 26, 27) and the ball bearing 12 itself is not more functioning ferrofluid seal as a protection of the clean room (for example, in disk drives) against coming out of the engine mount 12 particles given.
Claims (8)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3828081A DE3828081A1 (en) | 1988-04-29 | 1988-08-18 | SEALING DEVICE FOR ROTATING COMPONENTS IN ROLLING BEARINGS |
US07/345,932 US5011165A (en) | 1988-04-29 | 1989-05-01 | Sealing device especially for hard disk drives |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8805661U DE8805661U1 (en) | 1988-04-29 | 1988-04-29 | Magnetic liquid seal |
DE3828081A DE3828081A1 (en) | 1988-04-29 | 1988-08-18 | SEALING DEVICE FOR ROTATING COMPONENTS IN ROLLING BEARINGS |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3828081A1 true DE3828081A1 (en) | 1989-11-09 |
Family
ID=25871264
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE3828081A Ceased DE3828081A1 (en) | 1988-04-29 | 1988-08-18 | SEALING DEVICE FOR ROTATING COMPONENTS IN ROLLING BEARINGS |
Country Status (2)
Country | Link |
---|---|
US (1) | US5011165A (en) |
DE (1) | DE3828081A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6543781B1 (en) | 1999-09-30 | 2003-04-08 | Precision Motors Deutsche Minebea Gmbh | Spindle-drive motor with a magnetic fluid seal |
DE102006034966A1 (en) * | 2006-07-28 | 2008-01-31 | Schaeffler Kg | Rolling or linear bearings |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5155640A (en) * | 1990-05-03 | 1992-10-13 | Microscience International Corp. | Disk spindle motor cap |
US5214326A (en) * | 1990-09-01 | 1993-05-25 | Nippon Densan Corporation | Spindle motor with magnetic shield for magnetic fluid seal |
US5267737A (en) * | 1992-01-16 | 1993-12-07 | International Business Machines, Corp. | Magnetic fluid seal containment shield |
US5161900A (en) * | 1992-04-10 | 1992-11-10 | International Business Machines, Corp. | Self-contained low power fluid bearing and bearing seal |
US5473484A (en) * | 1994-06-03 | 1995-12-05 | Seagate Technology, Inc. | Apparatus for electrically grounding a rotor hub in a disc drive motor |
US5600511A (en) * | 1995-02-10 | 1997-02-04 | Seagate Technology, Inc. | Particle containment and fluid retention with barrier seal in magnetic disc drive |
US5969903A (en) * | 1995-02-13 | 1999-10-19 | Seagate Technology, Inc. | Magnetic particle trap for hydrodynamic bearing |
US5956204A (en) * | 1995-02-13 | 1999-09-21 | Seagate Technology, Inc. | Magnetic disc drive having magnetic particle trap for hydrodynamic bearing |
GB2302921A (en) * | 1995-07-04 | 1997-02-05 | Advanced Fluid Systems Ltd | Labyrinth and magnetic seal |
US5954342A (en) * | 1997-04-25 | 1999-09-21 | Mfs Technology Ltd | Magnetic fluid seal apparatus for a rotary shaft |
US6055126A (en) | 1998-07-06 | 2000-04-25 | Seagate Technology, Inc. | Disc drive having hydrodynamic labyrinth seal and magnet shield |
US6052257A (en) * | 1998-10-06 | 2000-04-18 | International Business Machines Corporation | Sealing structure for reduced lubricant leakage in a spindle motor |
US6229676B1 (en) | 1998-11-13 | 2001-05-08 | International Business Machines Corporation | Ferrofluid seal for actuator bearing |
US6421201B1 (en) | 1999-11-09 | 2002-07-16 | Seagate Technology Llc | Outcast and reduction of lubricants from spindle motor by utilizing a condensation seal |
US6558042B1 (en) * | 2001-12-28 | 2003-05-06 | Sae Magnetics(H. K.) Ltd. | Bearing guided ferrofluid seal and seal carrier |
US6850388B1 (en) * | 2002-02-05 | 2005-02-01 | Seagate Technology Llc | Apparatus and method for forming a magnetic fluid seal |
US7291287B2 (en) * | 2005-05-25 | 2007-11-06 | Ferrolabs, Inc. | Method of making magnetic fluid |
US7129609B1 (en) | 2005-08-30 | 2006-10-31 | Ferrolabs, Inc. | Magneto-fluidic seal with wide working temperature range |
DE102006002287B4 (en) * | 2006-01-18 | 2009-11-19 | Minebea Co., Ltd. | Spindle motor with fluid dynamic bearing system and magnetic seal |
DE102006000469A1 (en) * | 2006-09-20 | 2008-04-03 | Hilti Ag | Shaft bearing seal |
EP2672152B1 (en) * | 2011-02-03 | 2017-10-11 | Eagle Industry Co., Ltd. | Magnetic fluid seal |
US9377054B2 (en) | 2014-05-19 | 2016-06-28 | Seagate Technology Llc | Fluid seal for a rotating assembly |
JP7133263B2 (en) * | 2017-09-29 | 2022-09-08 | グローブライド株式会社 | Magnetic fluid seal device and bearing with magnetic fluid seal |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8702472U1 (en) * | 1987-02-18 | 1987-07-02 | Papst Licensing Gmbh, 78549 Spaichingen | Sealing device for rotating components |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2622945A (en) * | 1948-10-07 | 1952-12-23 | Arthur G Nickle | Bearing protection means |
US2861848A (en) * | 1956-07-19 | 1958-11-25 | Fairchild Engine & Airplane | Lubrication system |
US3889983A (en) * | 1974-04-15 | 1975-06-17 | Duff Norton Co | Rotary fluid joint |
DE2609736C3 (en) * | 1976-03-09 | 1981-01-08 | Anschuetz & Co Gmbh, 2300 Kiel | Device for lubricating a rolling bearing |
US4557490A (en) * | 1982-09-08 | 1985-12-10 | Tavares Luiz M C | Magnetic seal system for belt conveyor rollers |
US4604229A (en) * | 1985-03-20 | 1986-08-05 | Ferrofluidics Corporation | Electrically conductive ferrofluid compositions and method of preparing and using same |
US4817964A (en) * | 1985-09-25 | 1989-04-04 | Ferrofluidics Corporation | Ferrofluid exclusion seal and method of assembly |
JPS6314018U (en) * | 1986-07-11 | 1988-01-29 | ||
US4694213A (en) * | 1986-11-21 | 1987-09-15 | Ferrofluidics Corporation | Ferrofluid seal for a stationary shaft and a rotating hub |
-
1988
- 1988-08-18 DE DE3828081A patent/DE3828081A1/en not_active Ceased
-
1989
- 1989-05-01 US US07/345,932 patent/US5011165A/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE8702472U1 (en) * | 1987-02-18 | 1987-07-02 | Papst Licensing Gmbh, 78549 Spaichingen | Sealing device for rotating components |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6543781B1 (en) | 1999-09-30 | 2003-04-08 | Precision Motors Deutsche Minebea Gmbh | Spindle-drive motor with a magnetic fluid seal |
DE102006034966A1 (en) * | 2006-07-28 | 2008-01-31 | Schaeffler Kg | Rolling or linear bearings |
Also Published As
Publication number | Publication date |
---|---|
US5011165A (en) | 1991-04-30 |
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